#include <iostream>
using namespace std;

int maxn2;
int count(string s){
	int cnt=0;
	for(int i=0;i < s.length()-1;i++){
		if(s[i] == 'V' && s[i+1] == 'K'){
			cnt++;
			i++;
		}
	}
	return cnt;
}


int main(){
	int n;
	cin >> n;
	
	string s;
	cin >> s;
	
	int maxn = count(s);
	
	for(int i=0;i < n;i++){
		string m = s;
		if(m[i] == 'V') {
		m[i] = 'K';
		}
		else if(m[i] == 'K'){
		m[i] = 'V';
		} 
		
		maxn2 = max(maxn2,count(m)); 
	}
    	cout << maxn2;
}